Dumbbell base



FIG. 1 is an isometric view of a dumbbell base of the present invention with guides, engagement features, and certain protrusions shown in broken line and forming no part of the claimed invention;

FIG. 2 is a top view of the dumbbell base of FIG. 1 with the guides and engagement features shown in broken line and forming no part of the claimed invention;

FIG. 3 is a front elevation view of the dumbbell base of FIG. 1 with the guides, engagement features, footings, and certain protrusions shown in broken line and forming no part of the claimed invention;

FIG. 4 is a left elevation view of the dumbbell base of FIG. 1 with the footings and certain protrusions shown in broken line and forming no part of the claimed invention; and,

FIG. 5 is a bottom view of the dumbbell base of FIG. 1 with the footings and certain holes shown in broken line and forming no part of the claimed invention.

The back and right elevation views of the dumbbell base of FIG. 1 are mirror images of the front and left elevation views, respectively. 

The ornamental design for a dumbbell base, as shown and described. 